Time-dependent $CP$-violating asymmetries in $b\ensuremath{\rightarrow}s\overline{q}q$ transitions

Time-dependent $C P$ -violating asymmetries in $b \to s \bar{q} q$ transitions

K.-F. Chen et al. (Belle Collaboration)

Phys. Rev. D 72, 012004 – Published 8 July 2005

Abstract

We present new measurements of $C P$ -violation parameters in $B^{0} \to ϕ K^{0}$ , $K^{+} K^{-} K_{S}^{0}$ , $f_{0} (980) K_{S}^{0}$ , $η^{'} K_{S}^{0}$ , $ω K_{S}^{0}$ , and $K_{S}^{0} π^{0}$ decays based on a sample of $275 \times 10^{6}$ $B \bar{B}$ pairs collected at the $Υ (4 S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^{+} e^{-}$ collider. One neutral $B$ meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying $B$ meson is identified from its decay products. $C P$ -violation parameters for each of the decay modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two $B$ decays. The combined result for the $B^{0} \to ϕ K^{0}$ , $K^{+} K^{-} K_{S}^{0}$ , $f_{0} (980) K_{S}^{0}$ , $η^{'} K_{S}^{0}$ , $ω K_{S}^{0}$ , $K_{S}^{0} π^{0}$ , and previously reported $K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays differs from the SM expectation by 2.4 standard deviations.